Medical Terminology Chapter 1: Introduction to Medical Terminology

Fundamentals of Medical Terminology

• Nature of Medical Terminology:

  • Learning medical terms is comparable to learning a new language with its own grammar and vocabulary.

  • Mastery relies on understanding how basic word parts assemble and decode rather than memorizing every individual term.

• Four Structural Word Parts:

  • Word Root: Core foundation providing essential meaning, often referring to a body system, organ, or action (e.g., cardi = heart, cis = to cut).

  • Prefix: Added at the beginning of a term to modify or add detail to the word root (e.g., peri- = around).

  • Suffix: Added at the end of a term to modify meaning, indicating a condition, disease, or procedure (e.g., -itis = inflammation).

  • Combining Vowel: A vowel (usually "o") linking word parts together to facilitate pronunciation (e.g., cardiomyopathy).

Word Roots and Combining Forms

• Characteristics:

  • Serve as the foundational component denoting body systems, anatomical structures, or actions.

  • Terms may contain multiple roots (e.g., osteoarthritis contains two roots: oste/o and arthr/o), or no root at all (e.g., hypertrophy contains prefix hyper- and suffix -trophy).

  • When written alone, roots are presented as combining forms with a slash and vowel (e.g., gastr/o).

• Combining Vowel Rules:

  • Always insert between two word roots, even if the second root starts with a vowel (e.g., gastr/o/enter/itis).

  • Insert between a word root and a suffix that begins with a consonant (e.g., arthr/o/scope).

  • Omit if the suffix begins with a vowel (e.g., arthr/itis instead of arthroitis).

• Expanded Common Combining Forms:

  • bi/o: life

  • carcin/o: cancer

  • cardi/o: heart

  • chem/o: chemical

  • cis/o: to cut

  • dermat/o: skin

  • enter/o: small intestine

  • gastr/o: stomach

  • gynec/o: female

  • hemat/o: blood

  • immun/o: immunity

  • laryng/o: voice box

  • nephr/o: kidney

  • neur/o: nerve

  • ophthalm/o: eye

  • ot/o: ear

  • path/o: disease

  • pulmon/o: lung

  • rhin/o: nose

Prefixes

• Characteristics:

  • Attached to the start of a term to express anatomical location, quantity, or time/frequency.

  • Not all medical terms require a prefix.

  • Written with a trailing hyphen when listed individually (e.g., sub-).

• General Prefixes:

  • a- / an-: without

  • anti-: against

  • auto-: self

  • brady-: slow

  • de-: without

  • dis-: apart from

  • dys-: painful, difficult, abnormal

  • endo-: within, inner

  • epi-: above

  • eu-: normal

  • ex-: outward

  • extra-: outside of

  • hetero-: different

  • homo-: same

  • hyper-: excessive

  • hypo-: below, insufficient

  • in-: not, inward

  • inter-: between

  • intra-: within

  • macro-: large

  • micro-: small

  • neo-: new

  • non-: not

  • para-: beside, abnormal, two like parts of a pair

  • per-: through

  • peri-: around

  • post-: after

  • pre- / pro-: before

  • pseudo-: false

  • re-: again

  • retro-: backward, behind

  • sub-: under

  • syn-: together

  • tachy-: fast

  • trans-: across

  • ultra-: beyond

  • un-: not

• Number Prefixes:

  • bi-: two

  • hemi-: half

  • mono-: one

  • multi-: many

  • nulli-: none

  • pan-: all

  • poly-: many

  • quadri- / tetra-: four

  • semi-: partial, half

  • tri-: three

Suffixes

• Characteristics:

  • Appended to the end of a term; it is the only mandatory word part in every medical term.

  • Written with a leading hyphen when listed individually (e.g., -logy).

• Common Categories:

  • General and Pathological:

  • -algia / -dynia: pain

  • -cele: protrusion

  • -cyte: cell

  • -ectasis: dilation

  • -gen / -genesis / -genic: that which produces / producing

  • -ia: condition

  • -iasis / -osis: abnormal condition

  • -ism: state of

  • -itis: inflammation

  • -logical: pertaining to the study of

  • -logist: one who studies

  • -logy: study of

  • -lytic: destruction

  • -malacia: abnormal softening

  • -megaly: enlarged

  • -oma: tumor, mass

  • -opsy: view of

  • -pathy: disease

  • -plasm: formation

  • -plegia: paralysis

  • -ptosis: drooping

  • -rrhage / -rrhagia: abnormal flow / abnormal flow condition

  • -rrhea: discharge

  • -rrhexis: rupture

  • -sclerosis: hardening

  • -stenosis: narrowing

  • -therapy: treatment

  • -trophy: development

  • Adjective Suffixes (translate as "pertaining to"):

  • -ac, -al, -an, -ar, -ary, -atic, -eal, -iac, -ic, -ical, -ile, -ine, -ior, -nic, -ory, -ose, -ous, -tic

  • Surgical Suffixes:

  • -centesis: puncture to withdraw fluid

  • -ectomy: surgical removal

  • -ostomy: surgically create an opening

  • -otomy: cutting into

  • -pexy: surgical fixation

  • -plasty: surgical repair

  • -rrhaphy: suture

  • -tome: instrument to cut

  • Procedural Suffixes:

  • -gram: record

  • -graphy: process of recording

  • -meter: instrument for measuring

  • -metry: process of measuring

  • -scope: instrument for viewing

  • -scopic: pertaining to visually examining

  • -scopy: process of visually examining

Word Building and Translation Strategies

• Word Building Strategy:

  • Combine appropriate prefix, root, and suffix according to standard positional and combining rules.

  • Example: hypo- (under) + derm/o (skin) + -ic (pertaining to) = hypodermic (pertaining to under the skin).

  • Example: gastr/o (stomach) + -ic (pertaining to) = gastric (pertaining to the stomach).

• Translation Strategy:

  1. Divide the term into its word parts (e.g., gastr / o / enter / o / logy).

  2. Define each individual word part (gastr = stomach, o = combining vowel, enter = small intestine, o = combining vowel, -logy = study of).

  3. Translate the term by starting with the suffix and moving back through the word roots (study of the stomach and small intestine).

Pronunciation, Spelling, and Plural Rules

• Pronunciation & Precision:

  • Phonetic guides indicate stressed syllables in capitalized text (e.g., pericarditis pronounced per ih car DYE tis).

  • Accurate spelling is critical; altering a single letter can change clinical meaning:

  • abduction (moving away from body) vs. adduction (moving toward body).

  • ileum (part of small intestine) vs. ilium (part of hip bone).

  • Similar sounds with different spellings: psy vs. cy (psychiatry vs. cytology); dys vs. dis (dyspepsia vs. dislocation).

• Plural Rules:

  • -a $\rightarrow$ -ae (vertebra $\rightarrow$ vertebrae)

  • -ax $\rightarrow$ -aces (thorax $\rightarrow$ thoraces)

  • -ex / -ix $\rightarrow$ -ices (appendix $\rightarrow$ appendices)

  • -is $\rightarrow$ -es (metastasis $\rightarrow$ metastases)

  • -ma $\rightarrow$ -mata (sarcoma $\rightarrow$ sarcomata)

  • -nx $\rightarrow$ -anges (phalanx $\rightarrow$ phalanges)

  • -on / -um $\rightarrow$ -a (ganglion $\rightarrow$ ganglia, ovum $\rightarrow$ ova)

  • -us $\rightarrow$ -i (nucleus $\rightarrow$ nuclei)

  • -y $\rightarrow$ -ies (biopsy $\rightarrow$ biopsies)

Medical Records and Documentation

• Abbreviations & Electronic Medical Records (EMR):

  • Standard abbreviations save time, but unapproved/personal abbreviations cause medical errors.

  • EMR systems digitally log patient records, enabling error tracking, seamless sharing across facilities, and preventing duplicate diagnostic tests or medication errors.

• Key Medical Record Components:

  • History and Physical (H&P): Authored by admitting physician; contains clinical history, exam findings, initial diagnosis, and care plan.

  • Physician's Orders: Complete directive list of care, prescriptions, diagnostic tests, and treatments.

  • Nurse's Notes: Daily record of nursing care, vital signs, treatment specifics, and patient response.

  • Physician's Progress Notes: Physician's daily assessment updates, physical exam findings, and revised plans.

  • Consultation Reports: Written evaluation by a specialist requested by the attending physician.

  • Ancillary Reports: Documentation from supportive therapies (e.g., rehabilitation, respiratory therapy, social services, dietetics).

  • Diagnostic Reports: Formal test outcomes provided by laboratories or medical imaging departments.

  • Informed Consent: Voluntary legal document signed by patient/guardian detailing procedures, risks, benefits, and alternatives.

  • Operative Report: Detailed surgical narrative from the surgeon including preoperative/postoperative diagnoses and procedure details.

  • Anesthesiologist's Report: Details surgical anesthesia administration, intraoperative vital signs, and patient response.

  • Pathologist's Report: Diagnostic analysis of tissues or specimens removed during procedures.

  • Discharge Summary: Comprehensive overview of entire hospital stay, final diagnosis, treatment outcomes, and follow-up directives.

Healthcare Settings and Confidentiality

• Facility Types:

  • Acute Care / General Hospitals: Short-term diagnosis and treatment of acute conditions.

  • Specialty Care Hospitals: Targeted treatment for specific conditions or populations (e.g., psychiatric or children's hospitals).

  • Nursing Homes / Long-Term Care Facilities: Extended recovery care or assistance for individuals unable to perform self-care.

  • Urgent Care Centers: Walk-in facilities for non-emergent immediate care without an appointment.

  • Ambulatory Care / Outpatient Centers: Same-day surgical, diagnostic, and therapeutic services without overnight stays.

  • Physician's Offices: Outpatient medical services offered by individual or group practices.

  • Health Maintenance Organizations (HMOs): Prepaid healthcare systems offering comprehensive primary and specialist services.

  • Home Health Care: In-home nursing, personal care, or therapy services.

  • Rehabilitation Centers: Inpatient and outpatient physical, occupational, and restorative therapies.

  • Hospices: Supportive end-of-life care for terminally ill patients and their families.

• Confidentiality & HIPAA:

  • Patient records constitute privileged information with strict legal and ethical protection.

  • Written authorization is required before releasing medical records.

  • The Health Insurance Portability and Accountability Act of 1996 (HIPAA) sets federal privacy rules governing protected health information.